Looking back, my online activities as a child/teenager were fairly benign. That said, the internet has become replete with much more danger and objectionable content than I was exposed to as a child. I'm wondering how you, who have young children today, would think/react to some of my concerns. Would you consider these normal, preventive behavior or an invasion of your child's privacy? Do you monitor your kids activity?
I think it's important to monitor kids activity for their safety. I use Free SMS Trackers Without Installing on the Target Phone, this app can help to check conversations online. Also these apps can spy on WhatsApp messages without installing anything on the target phone. Today it's easy to check other people online.